Explanation:

- Noida : Noida is home to the world's largest mobile phone factory, set up by Samsung. It's part of the Indian Government's 'Make in India' initiative, which aims to promote local manufacturing and provide job opportunities.

- Hyderabad: While Hyderabad is a major hub for the technology industry in India, particularly known for its IT and biotech industries, it is not the location of the world's largest mobile phone factory.

- Amravati: As the planned capital city of Andhra Pradesh, Amravati is aimed primarily at government administration and infrastructure development.

- Sanand: Sanand is known as an automobile hub in Gujarat, particularly for manufacturing units like Tata Motors, but not for being the largest mobile phone manufacturing unit.

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